533951981 has 2 divisors, whose sum is σ = 533951982. Its totient is φ = 533951980.

The previous prime is 533951933. The next prime is 533952017. The reversal of 533951981 is 189159335.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 341880100 + 192071881 = 18490^2 + 13859^2 .

It is a cyclic number.

It is not a de Polignac number, because 533951981 - 2⁶ = 533951917 is a prime.

It is a super-2 number, since 2×533951981² = 570209436027648722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (533951911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 266975990 + 266975991.

It is an arithmetic number, because the mean of its divisors is an integer number (266975991).

Almost surely, 2^533951981 is an apocalyptic number.

It is an amenable number.

533951981 is a deficient number, since it is larger than the sum of its proper divisors (1).

533951981 is an equidigital number, since it uses as much as digits as its factorization.

533951981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 44.

The square root of 533951981 is about 23107.4010005453. The cubic root of 533951981 is about 811.2737065871.

The spelling of 533951981 in words is "five hundred thirty-three million, nine hundred fifty-one thousand, nine hundred eighty-one".